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- Title
Kinetics of triple-junctions in eutectic solidification: a sharp interface model.
- Authors
Wang, Haifeng; Liu, Feng; Herlach, D.
- Abstract
The kinetics of triple-junctions (TJs) in eutectic solidification is modeled by the thermodynamic extremum principle (TEP). It consists of two parts. First, TJs as the interaction of interfaces follow the interface kinetics according to which the temperature and concentration at the TJs are determined. This interface part of TJ kinetics is closely related to the eutectic point in the kinetic phase diagram. Second, TJs have their specific kinetics according to which their morphology (e.g., the contact angles in two dimensions) is determined. Using a new solution of solute diffusion in liquid, the TJ kinetics is incorporated into the current lamellar eutectic growth model. The model is applicable to the concentrated alloy systems and can be extended to any kind of eutectics. Simulation results of the rapid solidification of a lamellar Ni5Si2-Ni2Si (γ- δ) eutectic show that both parts of TJ kinetics can play important roles in eutectic solidification and need to be considered to improve the current eutectic theory.
- Subjects
CHEMICAL kinetics; INTERFACES (Physical sciences); MATHEMATICAL models; EUTECTICS; SOLIDIFICATION; NICKEL-tin alloys; EUTECTIC bonding process; VARIATIONAL principles; THERMODYNAMICS
- Publication
Journal of Materials Science, 2015, Vol 50, Issue 1, p176
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-014-8577-5